Answer
25
Work Step by Step
In order to count all the elements in set A, we have to add up the numbers in the circle of A.
This means:
$n(A)=15+n(A\cap C)+n(A\cap B\cap C)+n(A\cap B)$
$n(A)=15+2+5+3=25$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 10 - Section 10.1 - Counting - 10.1 Assess Your Understanding - Page 687: 15
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